I using the AVRASM assembler provided with the STK500.
It works fine BUT the lack of conditional assembly is a real nuisance.

There are probably a number of other AVR assemblers available with
conditional assembly (eg AVRA) but the last thing I want to do is swap a
limited but reliable assembler for one with more features but a much lower
level of reliability. In particular, the ability to always produce code that
actually works as expected is valued :-)

Can anyone recommend an AVR assembler with conditional assembly capability
and good reliability. Free would be nice but "for money" is OK if it works
well.